EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: jrozner on December 27, 2016, 02:27:16 am
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I'm laying out my first board in EAGLE and using an ATMega64A. I've prototyped it using an Arduino mega (and handful of other components) but am wondering what sorts of supporting components I need to think about when moving away from an Arduino platform and to my own custom board? I've jumped around in the data sheet and found some information about handling unused I/O pins, programming (for various methods), various special pins (RESET, etc.), and power limits but haven't found a suggested example wiring diagram with respect to supplying power or anything other signals like I've seen in some others. Coming from an Arduino I've never had to worry about most of this and just hoping to minimize mistakes that could land me with boards that don't work.
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power, decoupling, clock, ISP header - that's a bare minimum for any ATmega, and that's basically what you find on any arduino board (of course most arduino bards also has a usb-serial connected to 1st serial port of atmega)
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Just look at Arduino schematic and replicate it to the extent necessary for your project. In general, to have a self-sufficient ATmega board all you really need is an ISP programming connector, a few bypass caps on power supply lines, and a pull-up resistor on a reset pin.
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You cannot go wrong following Atmel's recommendations. See app notes AVR042 and possibly AVR040 if you have EMC concerns or requirements.
http://www.atmel.com/images/atmel-2521-avr-hardware-design-considerations_applicationnote_avr042.pdf (http://www.atmel.com/images/atmel-2521-avr-hardware-design-considerations_applicationnote_avr042.pdf)
Graham
I'm laying out my first board in EAGLE and using an ATMega64A. I've prototyped it using an Arduino mega (and handful of other components) but am wondering what sorts of supporting components I need to think about when moving away from an Arduino platform and to my own custom board? I've jumped around in the data sheet and found some information about handling unused I/O pins, programming (for various methods), various special pins (RESET, etc.), and power limits but haven't found a suggested example wiring diagram with respect to supplying power or anything other signals like I've seen in some others. Coming from an Arduino I've never had to worry about most of this and just hoping to minimize mistakes that could land me with boards that don't work.
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This is perfect! Thanks, I didn't know this existed.
You cannot go wrong following Atmel's recommendations. See app notes AVR042 and possibly AVR040 if you have EMC concerns or requirements.
http://www.atmel.com/images/atmel-2521-avr-hardware-design-considerations_applicationnote_avr042.pdf (http://www.atmel.com/images/atmel-2521-avr-hardware-design-considerations_applicationnote_avr042.pdf)
Graham
I'm laying out my first board in EAGLE and using an ATMega64A. I've prototyped it using an Arduino mega (and handful of other components) but am wondering what sorts of supporting components I need to think about when moving away from an Arduino platform and to my own custom board? I've jumped around in the data sheet and found some information about handling unused I/O pins, programming (for various methods), various special pins (RESET, etc.), and power limits but haven't found a suggested example wiring diagram with respect to supplying power or anything other signals like I've seen in some others. Coming from an Arduino I've never had to worry about most of this and just hoping to minimize mistakes that could land me with boards that don't work.